accountsservice: 0.6.46 -> 0.6.47

Semi-automatic update generated by https://github.com/ryantm/nixpkgs-update tools.

This update was made based on information from https://repology.org/metapackage/accountsservice/versions.

These checks were done:

- built on NixOS
- Warning: no binary found that responded to help or version flags. (This warning appears even if the package isn't expected to have binaries.)
- found 0.6.47 with grep in /nix/store/gd55py0d0scns044hqccrihgsv9k8g9r-accountsservice-0.6.47
- directory tree listing: https://gist.github.com/0f7bbf0eb1486bf773f561276689270a